454
FNCA52 TJSJ 201930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST MON JUL 20 2026
DISCUSSION
A FIRE DANGER STATEMENT REMAINS IN EFFECT FOR THE LOCAL FIRE
WEATHER ZONES. OBSERVATIONS CONTINUE TO SUPPORT ELEVATED FIRE
WEATHER CONDITIONS ACROSS THE SOUTHERN HALF OF PUERTO RICO AND
THE U.S. VIRGIN ISLANDS. CRITICALLY DRY FUELS AND PERSISTENT SOIL
MOISTURE DEFICITS PERSIST ACROSS PORTIONS OF THE ISLANDS, WITH
KEETCH-BYRAM DROUGHT INDEX (KBDI) VALUES EXCEEDING CRITICAL
THRESHOLDS. MULTIPLE FIRE INCIDENTS HAVE BEEN REPORTED ACROSS
PUERTO RICO TODAY, HIGHLIGHTING THE HEIGHTENED FIRE DANGER.
COMBINED WITH BREEZY EASTERLY TRADE WINDS, ANY NEW FIRES THAT
DEVELOP COULD SPREAD RAPIDLY THROUGH DRY VEGETATION, PARTICULARLY
ACROSS PUERTO RICO'S SOUTHERN COASTAL PLAINS. RESIDENTS AND
VISITORS ARE URGED TO AVOID OUTDOOR BURNING AND TO EXERCISE
EXTREME CAUTION WITH OPEN FLAMES, DISCARDED CIGARETTES, AND ANY
ACTIVITY THAT COULD GENERATE SPARKS.
PRZ014-210800-
SOUTHEAST COASTAL PLAINS-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE NONE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 0 40 20 40
TEMP (24H TREND) 73 (-4) 92 (0) 73 92
RH % (24H TREND) 87 (+4) 46 (-5) 89 44
WIND 20FT/EARLY(MPH) NE 14 NE 11 NE 12 E 12
WIND 20FT/LATE(MPH) NE 10 E 16 NE 8 SE 11
MIXING HGT(FT-AGL/MSL) 5480 4580
TRANSPORT WND (MPH) E 9 SE 13
VENT RATE (KT-FT) 43840 50380
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-210800-
SOUTHERN HILLS-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 0 50 20 20
TEMP (24H TREND) 69 (-5) 90 (+3) 69 88
RH % (24H TREND) 96 (+7) 57 (-5) 98 59
WIND 20FT/EARLY(MPH) NE 12 NE 10 NE 12 E 10
WIND 20FT/LATE(MPH) NE 10 E 12 E 8 SE 10
MIXING HGT(FT-AGL/MSL) 6070 5380
TRANSPORT WND (MPH) NE 10 SE 13
VENT RATE (KT-FT) 54630 59180
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-210800-
NORTH COASTAL PLAINS-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 20 40 40 30
TEMP (24H TREND) 73 (-4) 91 (+1) 73 93
RH % (24H TREND) 95 (+6) 61 (-3) 99 56
WIND 20FT/EARLY(MPH) E 14 NE 13 E 13 E 12
WIND 20FT/LATE(MPH) E 12 NE 16 SE 10 E 16
MIXING HGT(FT-AGL/MSL) 5030 5560
TRANSPORT WND (MPH) NE 15 SE 12
VENT RATE (KT-FT) 65390 55600
DISPERSION 5 5
DSI 5 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-210800-
NORTHERN HILLS-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 40 20 60
TEMP (24H TREND) 71 (-3) 89 (0) 70 91
RH % (24H TREND) 97 (+4) 65 (+2) 100 62
WIND 20FT/EARLY(MPH) E 13 NE 12 E 11 E 10
WIND 20FT/LATE(MPH) E 11 NE 13 SE 9 E 13
MIXING HGT(FT-AGL/MSL) 5220 6300
TRANSPORT WND (MPH) NE 14 SE 9
VENT RATE (KT-FT) 62640 50400
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-210800-
WEST COAST-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 50 30 40
TEMP (24H TREND) 71 (-3) 93 (+1) 71 94
RH % (24H TREND) 98 (+8) 56 (-6) 99 58
WIND 20FT/EARLY(MPH) E 16 NE 13 E 14 E 11
WIND 20FT/LATE(MPH) E 13 SE 16 E 13 SE 13
MIXING HGT(FT-AGL/MSL) 4650 4420
TRANSPORT WND (MPH) NE 9 SE 12
VENT RATE (KT-FT) 37200 44200
DISPERSION 5 5
DSI 4 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-210800-
EASTERN INTERIOR-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 40 40
TEMP (24H TREND) 71 (-4) 91 (+3) 71 92
RH % (24H TREND) 95 (+5) 58 (-3) 98 56
WIND 20FT/EARLY(MPH) NE 12 NE 10 NE 11 SE 12
WIND 20FT/LATE(MPH) NE 9 NE 12 E 9 SE 13
MIXING HGT(FT-AGL/MSL) 6950 6390
TRANSPORT WND (MPH) NE 13 SE 15
VENT RATE (KT-FT) 76450 83070
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-210800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 60 50 50
TEMP (24H TREND) 69 (-4) 86 (+4) 69 86
RH % (24H TREND) 98 (+5) 65 (-6) 99 62
WIND 20FT/EARLY(MPH) NE 10 NE 8 E 9 SE 11
WIND 20FT/LATE(MPH) NE 6 NE 10 E 6 SE 11
MIXING HGT(FT-AGL/MSL) 5450 4690
TRANSPORT WND (MPH) NE 12 SE 16
VENT RATE (KT-FT) 54500 65660
DISPERSION 5 5
DSI 3 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-210800-
CENTRAL MOUNTAIN RANGE-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 50 10 60
TEMP (24H TREND) 67 (-4) 87 (+3) 67 88
RH % (24H TREND) 99 (+5) 67 (-1) 100 67
WIND 20FT/EARLY(MPH) NE 13 NE 12 NE 10 SE 8
WIND 20FT/LATE(MPH) E 10 NE 12 E 9 SE 9
MIXING HGT(FT-AGL/MSL) 6150 6510
TRANSPORT WND (MPH) NE 13 SE 10
VENT RATE (KT-FT) 67650 58590
DISPERSION 5 5
DSI 3 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-210800-
CAYEY MOUNTAIN RANGE-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 40 30 50
TEMP (24H TREND) 69 (-4) 87 (+3) 70 86
RH % (24H TREND) 99 (+3) 64 (-2) 100 64
WIND 20FT/EARLY(MPH) NE 10 NE 10 NE 11 SE 10
WIND 20FT/LATE(MPH) NE 8 NE 12 E 6 SE 10
MIXING HGT(FT-AGL/MSL) 6420 4920
TRANSPORT WND (MPH) NE 14 SE 14
VENT RATE (KT-FT) 77040 59040
DISPERSION 5 5
DSI 2 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-210800-
VIEQUES-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 60 40 60
TEMP (24H TREND) 78 (-2) 90 (+1) 78 91
RH % (24H TREND) 84 (+1) 56 (-5) 87 54
WIND 20FT/EARLY(MPH) NE 16 NE 11 E 12 SE 13
WIND 20FT/LATE(MPH) NE 12 NE 12 E 11 SE 13
MIXING HGT(FT-AGL/MSL) 3260 3360
TRANSPORT WND (MPH) NE 15 SE 17
VENT RATE (KT-FT) 42380 50400
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-210800-
CULEBRA-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY MCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 60 40 50
TEMP (24H TREND) 77 (-3) 91 (+3) 77 92
RH % (24H TREND) 87 (+4) 59 (-7) 90 56
WIND 20FT/EARLY(MPH) NE 16 NE 11 E 11 SE 14
WIND 20FT/LATE(MPH) NE 12 NE 11 E 11 SE 14
MIXING HGT(FT-AGL/MSL) 3250 3430
TRANSPORT WND (MPH) NE 13 SE 17
VENT RATE (KT-FT) 35750 51450
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-210800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 70 30 20
TEMP (24H TREND) 72 (-4) 93 (+2) 73 93
RH % (24H TREND) 91 (+10) 45 (-9) 92 46
WIND 20FT/EARLY(MPH) E 14 E 11 E 16 E 16
WIND 20FT/LATE(MPH) NE 13 SE 17 E 10 SE 17
MIXING HGT(FT-AGL/MSL) 4270 4520
TRANSPORT WND (MPH) SE 5 SE 16
VENT RATE (KT-FT) 17080 63280
DISPERSION 5 5
DSI 2 5 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-210800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 60 30 40
TEMP (24H TREND) 76 (-3) 89 (+3) 77 89
RH % (24H TREND) 89 (+5) 61 (-5) 90 58
WIND 20FT/EARLY(MPH) NE 16 NE 11 E 11 SE 14
WIND 20FT/LATE(MPH) NE 12 NE 11 E 13 SE 14
MIXING HGT(FT-AGL/MSL) 3180 3300
TRANSPORT WND (MPH) E 14 SE 20
VENT RATE (KT-FT) 38160 56100
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-210800-
ST CROIX-
330 PM AST MON JUL 20 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 30 40
TEMP (24H TREND) 77 (-2) 89 (+2) 77 91
RH % (24H TREND) 86 (0) 60 (-5) 90 58
WIND 20FT/EARLY(MPH) NE 14 NE 11 E 11 SE 16
WIND 20FT/LATE(MPH) NE 11 NE 11 E 12 SE 13
MIXING HGT(FT-AGL/MSL) 4880 5040
TRANSPORT WND (MPH) E 13 SE 17
VENT RATE (KT-FT) 53680 75600
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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